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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00239395af8d02b99726c2c080ea31e3a3cd3739fd295ac52c13e8be82a49900' 
  AND token = 'aZz9I8DnX3VDS7STDJw2jMLSABmAn2jICbISioRH3+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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