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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259e69ca4e18ba432e705528466d667bc605f0fc145699189e7832f132c589b3' 
  AND token = '8id8Yid96Q6f++0hpKNSpczD9tWGeBXQ6CDfC86irYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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