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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fa17111a251ed2532d3f1f1b7777a13d4fa7ea1b0cabc83b0973df377eff8c' 
  AND token = 'GFrcDu2woo1ylTsmO6ugj8Pnuad/Uu8SitxxbTtpR1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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