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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c14b47bfd5777c434ab103aa0c6af4321b9e6c96a3b57c5c870ee7f7d9e4c5c' 
  AND token = 'gkdbpCS8BtnacBeCUk7/zvB7AhzZ2TsaMMh4wAip4bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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