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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1489672f3e53a90c2b60fdc67779ec7492fea28e0ec47a792fe8e11dc12b50' 
  AND token = 'Pbe56dfS7r+fl4Eb+zfFbIk3NCx42/xdPYV6HxHMVIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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