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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd0d224c2f58134c02801e31f7a24ce87233581aa1ddac070303d83dafe24cc' 
  AND token = 'c/tbOeGo89SaIllpesWEiCxHZ6Bx3Z0kpw1ENyQ+shA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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