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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20aa14907e20ccdc9be3afaa63ec586ea097abdec27954fb08af3978477fd2d' 
  AND token = 'HZ5C/kyaoaeb/aU3NGX9/+8JcUcxveAKFQAaICwW37E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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