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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7a2b0712d9878fff80de137943a34389e20f2ba5fc9f204807b07be416bd52' 
  AND token = 'QkGPqS2TinAqlgbtyyDMqjy1L4Cf7krrGg3ba3VLN7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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