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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2acb319202ddf8faeb827e619e0e2029c5d231f8f52344df0f508d6fc7899696' 
  AND token = 'QbmxJSzJsbDdEQfQWkq8RsxGn/fPM+vKN6uLii8jnms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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