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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99b55b4d8a7e87f5e50247bf794d30d3857df9163b27bd6a6617cad606e498c' 
  AND token = 'krAAi23Dp5lERDmgkWjNgNakr5HfiNsT13pfnlhQ1YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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