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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc34d46645801249fb0075493e272bb4aeaebddec1ff57b28272d34ce4bae18f' 
  AND token = 'DkqXmZ6H5rdMSZg54Ma0sNLdCZ/avT60wNVSf/7J0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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