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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806e120d2ce439a8227312a8b36fe699ea193ec8537ba320f693e07946582f3f' 
  AND token = 'oQbSvK93KE+vhNdRbC8JBaya2/q9ajgwx2gmDlJqkho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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