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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d73dc7e0af48478b187718db810c5ba8e59eecd57f47c4959aab8cd3458697' 
  AND token = 'kz365a0oNoTCzTYigWo+Vd3wIcxrDlQETCsywIfFo54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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