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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd446e7224bb69f97a24a33e21407c6df5f9810a522be9d3dbd6e470483ca12' 
  AND token = '3DwNwoDteDeHT/CaleVrNbjsHQgtIzeWxOKVfaC5F2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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