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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1dbaa514f9c60bbaf1af01b17859c77be1c4aa746c2fe32704f102269ee68d' 
  AND token = 'm6U1yl1NWPnrYfnf9JH7HZiglHgiT+nHGLJ5pmJRRNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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