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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2772c01d001bc041b8441386ef998f9a68706cd42a0ac0a9b11bbac61351deea' 
  AND token = '7S4Z1QgyVeXl0Fk8NPUH0H1y3h1ee3ZZ1lRaE7tJ494=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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