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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a939572cdc0ba27e6a938d5094c7cd40b854b5a7c8d58f3565c032feb0b434' 
  AND token = 'e3D1DfGZ+lXn+eDlb17l2USBSpx45j48Fa7IZ5V5NK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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