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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e796af621c39d5c1123ce48725990ed90503db5f2239cb97ba594aba85038e' 
  AND token = 'p3luR7wn675+AGaufsM+OWVDThVPbHWly+XOpdXwU7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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