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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae6cd3ff10644f4c293e6aa62b0e6ec6e4fb457ffaed6033e91a97b7e1f883c' 
  AND token = '/XRlC6SuQKRQ+m3zl3fuiCilfKLe1iUMyaC+TVQ9V+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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