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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7768443d1b721ff71c314019f1e7e23a7bd8df47d8e6cf590c20ec6137a8eb58' 
  AND token = 'fyWa6H+czqHoQ5BbKJjO4WjlffOJtF8Fms9N3D20LJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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