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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7edf779936537c7af631352cd885ab763b4db84c96fa9c1190333509012ae2f' 
  AND token = 'R2x+QDPPFNliuwBml1OKdMYrd0YlOEgR+yGpSxTBx6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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