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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e0ec2f93477c9fbc3f06fd89af759ca3eb10276d18b1df29d73a0a95237475' 
  AND token = 'v4so1Kn92/qhpMqQC3i2TKiqUnuoZRAMMFGN0IajHPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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