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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7e066ce83d732b20be3cb91474f193c41941cbb83b9d489978e49259c6d190' 
  AND token = 'fCyznPdl3VZhwRCBzrrrxmpzeD1mBA3t4sfqs3zZfN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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