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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08e90578b9fcf03f24638fb92b40eb1bd36f2fd20e6dca2c6caa58328566c3f' 
  AND token = '+BMtX8bDszL7PjdJixCDgwSMgekJQE3TbNUIv2cz+b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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