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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6ea9e826e591331e7234d680d7daf2a0163c146852a6edbee0d31036ceef20' 
  AND token = '1O6N9/9SJnHg5ijzmfE2+5fKOxxd/iggjne7RALwHVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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