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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a28a15fff3f2a33fa04c01c3d971fbd487a4e411e2276e7b9e5f6937d4f481' 
  AND token = 'zUDU9MvZa6oX2ksYMGIp90sO62P2oNlZufPKM17R1ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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