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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3a873a952af988002ae20a1ca8d7c6212d162c8f378fdb1c2028fb65581b50' 
  AND token = 'KH98buTmESAJOq/qsSz90ylxz6XkD6h3V2g55pr9MBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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