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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd9177e59b3e49aec45ab7b4955cf82e88b814ff2eef0da2fa9a4ee967f4dcb' 
  AND token = 'l1Rx4MY6sBoFCo1E1cdb3VTvv7Eso1MuBhQ59cFOkUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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