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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa62cdbd21e0cf7a6c6a1c2149b0214fa387d1ff9f5ba1e61e1213e69b236d1' 
  AND token = 'Tdoaj7p7caoQrjTZgsqpnWxblzzC6+h826yi3mIQ0Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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