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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5e947d09edfbddb2011fa218bb54c19b35480a54bc1ebb7fede8afc48d4438' 
  AND token = 's3EQnZMyB/c5K2DhGbG0WTFLuFbLd0KD1M1QfCEmMyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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