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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850a42d2f15002d8eb0e9136e69af604289cd379fbddb1ea9098549d902cb982' 
  AND token = 'E2HFc4GZpzNZpZ2sXlO3Qcrls93Fy3sQBO/nkRWYr/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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