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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dfff975729fb8ac7352d98e9ef08111d36b89b362caaa22c98df6fffa71247' 
  AND token = 'KAYFNhCRsgbEwZUJFol6iz1kksPCV4dtDetBCx4lkHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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