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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6465c9b3b5ac9757b6835a58c0fa21ee2ff393dad838fa4cdeb4fab36ba471f2' 
  AND token = '3lqCmtm6jrDFPza04W59E8a01qXi2jFjm7mqU4BYSq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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