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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd922146b82fc156874065978ccdee76cd3e999313765c7a224bebb48e78c5b19' 
  AND token = 'UoSwz0ZyB2MIQ1Yiakk99xmg+cIFcX4OSnAI7/8bOeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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