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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22589f39e24f498c1c98862fa67e3c6fe154975abb391da5878663a10167401' 
  AND token = 'XJ9/N+EliPaF45dNpPnd7eGF3YwZqec+l5jhSECatsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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