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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbfd7674031730a7fd1279a71a2c7ca35e583400d31c8c1287eebedb48e3eb9' 
  AND token = '7SZLlG4uZLw2DHBi4ywxuWiLfHXS2oSwdlL00u33sc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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