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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba7bb93c8c4f1c126e0dbd0dc9bd8ddcac13620421b6b8d166d79dc28526d3b' 
  AND token = 'mwlW+0mo3KkYao9+mePjbFBFexS+HEzwMB4fLZIyoNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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