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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8630ab7aba74782df47f6b42d35b3fc626369513600c555cf58b75dc5968faa4' 
  AND token = 'HBlK28WAPdLUn8FleQCV9A2jQ6ZdCWF68eo66AcZv78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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