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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976819985a4ca29c2cb888468189e59f2e15a73d391832a7c64c70c39ef5da7e' 
  AND token = 'UEfhqk8VGTxHhi5dk0WakI6qeLEPjKuY7x1xC+puNOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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