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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3690f8a406d9a91a4493028ce5e3572c4909a974d2de7dd83b269aa19b74fcd' 
  AND token = 'zsL8fEcyRx1gpMAH9mD4LM3Teusmx16IsAEZOe9oixA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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