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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612f37b765b10139917baa98bc7ec37608eb229153eaad467b8e0944cffd0175' 
  AND token = 'gDlurNaMHb+1NO++5Jhq5A2cRiUYqPe+UaHF9ewee/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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