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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513a8cf88b24dfaf5cea76e484a5427260fb96bc71e6900f0f50b0b29012d62f' 
  AND token = 'On1S5ZqI5jEh3G5BewwLcdggydbo2QjiLcvR8Kqu6VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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