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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b14d2a002eeeb77a21f936d98e84481e1b252baea462d9eda7b03f49f8ec439' 
  AND token = '1/dV7Z6EobCG2nNhCKRZsiaQPG6pHV5H0cy+IpstHJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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