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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f3d78eaf4019a67137b0afaae950958f85704479d2cececf7a9506b7b8ffe0' 
  AND token = '6s63XdKh9a4cfq8CvRNFgTSLVGH73+sIgX+9GzcCc6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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