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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c24af2ef61899341c15913a7262901de5f58b3ba9c1355727f51aeae18441e3' 
  AND token = '+UivJFNKFRY+ea9jJZkYP4iAWEq0Wgy4D61UDzEW0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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