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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95747573bb926d89ee3f7fe9f88a6b0736b7263fbe7acc355e242fdba693cc54' 
  AND token = 'fsgov5Tp9jVTHMpECkwD3mp7hamFZYC6DLWocMEUx1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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