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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9067a1d5dc4221a7cefde8d4995a61ca905d2751943cb717278fda1c4661ddb' 
  AND token = 'hj1KVvklQy/X4SV5uTzvU5n+ubWAzv8ydFSGOm6RrUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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