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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca33a2d78262669eb0df6f38c7ea49513c4f46d1abec9119a43b47983db58ee' 
  AND token = 'SCZZo27teFfPnULcnH0NB6wSoLzSFrE5squbQOs/TmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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