SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd309a55c557eb2e960b5a81c3bcd6b2d4a7f3821165330c8e12a32fb761907ef' 
  AND token = 'LG/CSNFcpwoDywTwQM1H5G220KZoBnIVVkPJRWyqCTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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