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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d39fb888c560f75c7d1dd455154aef7106b3aee6448b44f74ea708a72953d5' 
  AND token = '2HxGzH7TKcxbG/1ZoAoqhaIPa0m2940DAXubcsDEWbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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