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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1ef184931a92b6a17a76fb641a38c59a996f6d18fd77c16d2c1327150f880d' 
  AND token = 'fc4AgONArWNB12kaZ5FOupK22Rr8RtGmQY8vfOnGa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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