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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398ca76fd9373ebd827170b121c8e3b912dba7cc638940cf6ab3ab28102b64e3' 
  AND token = '6MbYVvkM9/iemZd/sZ4+TnI4D2E9E2yJj4chbJjpWIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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