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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1a1e10d876fa6f05e137389eaa7e4163c4304d0d831ecdaed5259191c3f7a' 
  AND token = 'haUp0gGUBSrLL34M5YhMc1hqmshyXir9l8iP08bVSv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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