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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e2e9e55100dd687a4c49fec6f1610b405fb4f7f8eaf03d9b18dc50ee789160' 
  AND token = 'si51w82cNfneOE6fJSWSnPGTkRw+uIJ6gkf8iLWfhUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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