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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4166df3967f9138651d1a9cd6fe34bb75552306841244e4e7163180f6ac636f' 
  AND token = 'hZ84NosBO6c3do0kyuUBF1NhuLEh7NZSr602fCcKSow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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