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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a633b93ea6ca9ec3374426a275a3995e4acaf8139a062860bc7e42e696fb005' 
  AND token = 'yLQUQbl3TOjHEDUrS+bw053JLDuNGRKdza3SHMkvIHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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