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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8ab46445d98077dbed284fdd27d40a2d7933fc0c2b9465e04c666f8cae9a7b' 
  AND token = '//B/Xr84ogSxHhkXjS3uBSoNhXBg+CsGnzerduUbFo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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