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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927ea93f1fb6e58e4222ad6f189bce45b0912fedf271d12f36521f3b7d7c5564' 
  AND token = 'GLDBokl9jnVseAZbP1Ba7oTQpuqkqwicEgEVAtVIRB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}