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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dcb441e48786b5772e3f584b67fb411585abc84a7096f080fdc95308e57310' 
  AND token = 'mAd7FWaE7MJcnlRBa9h5Z/k3xsRuN55glaaCxmeLM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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