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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79c6ad71c9ace779b2c7f93ff89b2e43d3cb60f71dde6d25c5bc3cf6b6da67f' 
  AND token = 'P+H1EnUAuXnjR5gODp2HBoyT4Q7z8F21/tG9DO42xjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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