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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b208e058ffe8b5840388beaba9a87cdafd48c82d645e4a4cd13ca82d376aac83' 
  AND token = 'LQEIok8YjR09lwOdzDFzbI59Sz9hjePbJYEAPXh1jI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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