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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8f6cc6344ac2f87050c8c46242c66f23e0bf222885aa7acaf09ecfef072f6a' 
  AND token = 'gUhbrwePbY1VR102D0d8PgUkVARoX8qVwaoP3ZZIt1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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