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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a641cbddd1576330b2d36db25f8337c727216180506bc57773c63e3ae18c4d0' 
  AND token = 'u0EtMS/aHM+vcZ8g+HcgOs9EQ7U8+1vTKNbzyM5lg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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