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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5145c62ca1c6b284ea31b01c330ae63a848394ffb2f186a4076f4e410bb8aeef' 
  AND token = '9ufC7yngmy5/iZp0hgXIsXVcc4FARNKeOnHY+f3BKK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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