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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93aff88e8e377117377680d899da62218665e2e5e03c0dda98a9a6fa838a5a1' 
  AND token = '/Q0QNjeTNLTN63jKFKnyVSbUDUPA5gdhJaiK6ynLobI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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