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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcc2eccd3ae783ac3e4ee3723e8984e63e4d0c4961777a4024b6bdc1523b3f5' 
  AND token = 'iQI7mA1kK/QDpd3UscYT5KXpRDZWjgr3MCJ8FXGop5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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