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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87a681da8c9b7d5b0a00426cc337f3562754c3ec00fe2e987c7ca8d33ae742a' 
  AND token = 'jdGHQjD4oNtbXPr24Wz9WQIKKCxQR9b+lDoMSYFzGps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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