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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc94ed75ebe65fc935a49e6e7c3bdd98cc393c9d377b2de5b58230768c27dff7' 
  AND token = 'HBJWtCJqNjIdgontP8VWyWK1aKnkgvK7B3AEh9ghrVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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