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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef0e91fb2cbb8cf654b7f4fa0b6bc942bf5bff0313cd1f9384d9b4cf704494a' 
  AND token = 'UM8FzBU/1PT9Cdnk2F21sXHBdEfo9mb8XqsI76meuNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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