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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a58c99088b6e081ad659b50d9b5cb22411827b5295d0f86fdd1846ece04461f' 
  AND token = '6CbFI2DbpbIbhg1BvQmVZX4oT3X30JOWY0mivSGuJ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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