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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6360f12d3fbadec996869384b37698537796da254b81dd209e1605caa82b1d9' 
  AND token = '6T79mUOueshJy3Ls9fAp7draxtqGKUavQZg7U5FgUK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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