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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd674125b0aede97254615b09744066576b99488ac01a67d8c30e6c8b8fc6d0df' 
  AND token = 'tgNU2cS+IAsTXESJ4G2eEMRl+gu+BscbQzWHBJe4m+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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