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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb7346220f4ce6bff55b26c72ebcc582fb04cb22dd39226c626e6e802bd5fd4' 
  AND token = '2r96N5RoqGJcLc5HzBqKv2YZ2iVqZw/AqJoDdETR8bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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