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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911ac044dd0ee76a137339c14604dc0a674ef7ae2a51657648134b4f5390ab0e' 
  AND token = 'mRE+22tQTXoEHfCQAbHFb31Y+q/4dW0lHk7YNY+0Dl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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