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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51690d765f38ff37c6ab3411b4ea16ec7759660712a94eb7a5cc2e0c79b0db98' 
  AND token = 'PB/1jzD7Y0UbEHzlt90l1pB7pYj7mMeH1HyJcIKU8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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