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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e41de933cd283d8972cec1f6246942f4760bf71306faf4f3a69ff780e75c706' 
  AND token = 'yk4zMFuUe5tYn+h1AJpJh4LaVSwLLB5eJO41LOajj3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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