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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9eef3bc1c7c9382b265f5c49f598bbb907ff87422b6d45d23fa9a0c62587e3' 
  AND token = 'QyC6lttHw5QttaM6kXxKkCi93SXD9Mlb17bOTb8eObM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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